<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>sessionStorage</title>
</head>
<body>
    <h2>sessionStorage</h2>
    <button onclick="saveData()">点我保存一个数据</button>
    <button onclick="readData()">点我读取一个数据</button>
    <button onclick="deleteData()">点我删除一个数据</button>
    <button onclick="deleteAllData()">点我清空数据</button>

    <script type="text/javascript"> 
        let p = {name:'张三',age:18}

        function saveData() {
            sessionStorage.setItem('msg','hello!!!')
            sessionStorage.setItem('number',5555)
            sessionStorage.setItem('p',p)
            sessionStorage.setItem('person',JSON.stringify(p))
        }     
        
        function readData() {
            console.log(sessionStorage.getItem('msg'));
            //从sessionStorage 读取数据
            const result = sessionStorage.getItem('person');
            console.log(JSON.parse(result));            
        }
        function deleteData() {
           sessionStorage.removeItem('number')
        }
        function deleteAllData() {
            sessionStorage.clear();
        }

    </script>

</body>
</html>